Question about Kenwood iTECH iQfive iQplus TK250-350-353-430-431 Compatible Two Way Adapters 2-Way Radio

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No Display Dead Radio Kenwood TK 350 G

We get many of these very nice older radios for service. I am aware of the one popular fix for the above listed problem. The SMT crystal under the top cover by the knobs and display can be defective or the radio falling to the ground dislodging the chip crystal from the board.

BUT we have several 350 G's in the shop with the above listed problem and it's NOT the easy fix of the crystal. Using substitute bench supply and the fuse is good. I hear a little pop in the speaker, when first turned on........Dead radio....no display. What suggestions do you fine folks have so I can get these units back in service.
Thanks ..................fred Greenville Pa.

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  • Master
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Hi and welcome to FixYa,

Initially, have you tried a reset? Additionally, pls check for:

  • +4.5 at pin 21 of uPD7225 through R71 & R2; and/or
  • +4.6 at pin 58 of 75P116 through L1 & R92 from regulator IC7;
  • resistance of the center leg of the crystal to GND, 33ohms.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Dec 02, 2008

  • Louie  Role
    Louie Role Dec 04, 2008

    Hi again,



    Any updates or developments so far?





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  • Master
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I would suggest to inspect all the solder joints using at least 10X microscope as well check for proper crystal oscillation. If everything looks normal then check the transistor(s) that turn the back light power ON for the LCD driver IC.

Posted on Dec 02, 2008

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  • Master
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Hi,
there is sum loosing wire problem in the display.

Posted on Dec 02, 2008

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Hi i think the circuit is weak......it is better to solder and then see the speaker.i think it will work thank u......please rate it

Posted on Dec 02, 2008

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The fuse is most likely to be blown out .

Other chance display may have contact problems .


Posted on Dec 02, 2008

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